<template>
  <div id="app">
    <form @submit.prevent="submitAuth">
      <label for="username">账户名:</label>
      <input
        type="text"
        id="username"
        v-model="username"
        required
        placeholder="请输入要认证的账户名"
      >
      <button type="submit">提交</button>
      <p v-if="error">{{ error }}</p>
    </form>
  </div>
 </template>
  
 <script>
 import { ref } from 'vue';
  
 export default {
  setup() {
    const username = ref('');
    const error = ref('');
  
    const authenticateUser = async (username) => {
      // 这里添加您的用户认证逻辑
      // 这里只是一个示例，实际应用中应该发送请求到后端API
      return new Promise((resolve) => {
        setTimeout(() => {
          resolve("admin".equals(username));
        }, 1000);
      });
    };
  
    const submitAuth = async () => {
      error.value = '';
      const isAuthenticated = await authenticateUser(username.value);
      if (isAuthenticated) {
        // 认证成功，可以跳转到成功页面或者直接处理认证后的逻辑
        alert('认证成功');
      } else {
        // 认证失败，返回错误信息
        error.value = '认证失败，请检查账户名是否正确';
      }
    };
  
    return { username, error, submitAuth };
  }
 };
 </script>
  
 <style>
 /* 基础样式 */
 #app {
  max-width: 100%;
  margin: 0 auto;
  padding: 20px;
  box-sizing: border-box;
 }
  
 label {
  display: block;
  margin-bottom: 10px;
 }
  
 input[type="text"] {
  width: 100%;
  padding: 10px;
  margin-bottom: 20px;
  border: 1px solid #ccc;
  border-radius: 5px;
  box-sizing: border-box;
 }
  
 button {
  width: 100%;
  padding: 10px;
  background-color: #007bff;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
 }
  
 button:hover {
  background-color: #0056b3;
 }
  
 p {
  color: red;
 }
  
 /* 响应式设计 */
 @media (max-width: 768px) {
  #app {
    padding: 10px;
  }
 }
 </style>